PT-2024-8913 · Linux+3 · Linux Kernel+3

David Sterba + 1 · Published 2024-05-24 · Updated 2026-03-14 · CVE-2021-47508

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions: Linux kernel (affected versions not specified)

Description: The issue is related to a memory leak in the btrfs component of the Linux kernel. When btrfs qgroup reserve data() or btrfs delalloc reserve metadata() fail, the allocated extent changeset is not freed, leading to a memory leak. This issue only occurs in the direct IO write path, specifically after a certain commit (65b3c08606e5) that fixed an ENOSPC failure when attempting direct IO write into a NOCOW range, and also at defrag one locked target(). The memory leak can cause problems, but the exact impact is not specified.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

BDU:2024-10581

CVE-2021-47508

SUSE-SU-2024:2008-1

SUSE-SU-2024:2019-1

SUSE-SU-2024:2190-1

Affected Products

Debian

Linux Kernel

Red Os

Suse

References · 1182

• https://osv.dev/vulnerability/SUSE-SU-2024:2019-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47508 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2190-1 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2021-47508 · Vendor Advisory
• https://git.kernel.org/stable/c/ca06c5cb1b6dbfe67655b33c02fc394d65824519 · Patch
• https://git.kernel.org/stable/c/da5e817d9d75422eaaa05490d0b9a5e328fc1a51 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47508 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2024:2008-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47508 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47508 · Vendor Advisory
• https://bdu.fstec.ru/vul/2024-10581 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-47508 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47508 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-47508 · Vendor Advisory
• https://bugzilla.suse.com/1223819 · Note